Crushing machine



Dec. 15, 1936.

A. KRUSHEL CRUSHING MACHI NE 2 Sheets-Sheet 1 Filed Nov. 28, 1934AKRusHEL BY W ATTYJ.

Dec. 15, 1936. A. KRUSHEL cnusnme MACHINE 2 Sheets-sheaf. 2

Filed Nov. 28, 1934 ATTYd min-2:-

Patented Dec. 15, 1936 UNITE PATENT OFFICE. v

1 Claim.

The invention relates to improvements in crushing machines andparticularly a machine for crushing granular substances and cereals,such as wheat, oats, barley, rye and an object of the invention is toprovide a machine which may be tractor driven and is of high'speedcapacity, normally rotating at from 2,000 -to 2,500 R. P. M.

A further object of the invention is to provide a machine which can bemanufactured at relatively small cost, which is simple in constructionand which has a large capacity for grinding and. which is arranged sothat the grinding plates may be easily and quickly adjusted to grind thesubstance being ground coarse or fine as occasion demands.

A further object is to provide a machine with a worm for feeding thegrain to the grinding plates and to arrange the worm so that it willautomatically cease to be driven should it engage an obstruction such asa stone and thereby avoid damaging the machine.

A further object is to provide means whereby pressure against the wormmay be manually ad- 7 justed as desired through the action of a springand collar.

A further object is to arrange the crusher so substance being groundcoarse or fine as occasion demands.

. A further object of the invention is to provide an angularly disposedreciprocating sieve to screen the substance gravitating into thegrinding chamber. a

Withthe foregoing objects in view and such other objects as may appearas the description proceeds, my invention consists in the constructionand arrangement of parts, all as hereinafter more particularlydescribed, reference being had to the accompanying drawings, in which:-

Fig. 1 is a side elevation of my machine.

Fig. 2 is a sectional side elevation ofmy machine, showing parts of themain frame in full elevation. 3

Fig. 3 is a front elevation of my machine.

Fig. 4 is an elevation taken on the line 4-4 of Figure 2.

Fig. 5 is a sectional detail of the roller bearings and feed screwadjusting mechanism.

Fig. 6 is a sectional elevation through the worm feed and associatedparts.

In the drawings like characters of reference indicate correspondingparts in the different fig-- ures.

My invention consists of a frame work in the form of a trestle A withits base plate drilled for bolting to a suitable foundation and a castbody portion B. This body portion is provided with a base i semicircularin cross section and the body portion being surmounted by a hopper 2,into which the substance fed to the machine is passed. The body issupplied at one side with an outlet opening 3 for the substance which isbeing expelled by worm feed later described to the crushing plates.

The side of the body containing the opening 3 is extended as indicatedat 4 so that it closes one side of a grinding chamber 5, the other sideof which is closed by an opposing casing 6, said casing being bolted tothe extended portion 4 by means of bolts provided with coiled springs lmaintained in bearing contact with projecting ears 8 upon the casing bymeans of threaded nuts 9. The casing is supplied with a stuffing box H]to which is bolted a shaft housing ii.

A shaft I2 extends clear through the body B, through the stuffing boxIf! and through the shaft housing I I its rear end being journalled inbearings l3 and M. A sleeve I5 is mounted upon that portion of theshaftwhich extends within the body portion B, this sleeve being providedupon its periphery with a spiral feed screw it. The forward end of thisfeed screw projects through the opening 3 and into the grinding chamber5. Upon the rear end of the shaft 12 is a pulley H which may beconnected by means of a belt (not shown) to a source of power.

Within the grinding chamber 5 upon the wall 3 is bolted an annulargrinding surface 18 while upon the shaft and also within the grindingchamber is a grinding'disc I9, either face of which is bevelled as atl9a inwardly towards the hub. This grinding disc is provided with anannular grinding surface 20 bolted thereto and opposing the surface l8and the disc is provided with a hub 2|, the inner bearing surface ofwhich is convex in configuration as shown in Figure 6, thus in practicepermitting a slight rocking movement of the disc, and this whole discassembly just described being free to rotate upon the shaft 12 while thegrinding surface l8 remains stationary.

A cotter pin 22 extends diametrically through the shaft as clearlyshown, the front side of the hub 2| being diametrically notched as at 23to receive this member. The opposite side of this hub is also notched asat 24 for the purpose of receiving a rib 25 extending diametricallyacross the front end of the sleeve I5.

A flange 26, in the form of a washer provided with a ball race 21,extends around the reduced end 28 of the shaft l2. The portion 28 of theshaft is diametrically bored to receive a cotter pin 29. A screwthreaded spindle 30 extends through the internally threaded boring 3| ofthe shaft housing and is provided with a head stock 32.

Upon this headstock is mounted an annular ring 33 provided with acircumscribing groove 34. The

grooves 21 and 34 are in alignment, thus forming a ball race 35. Theforward end of the spindle 30 is provided with a handle 36 behind whichis a tightening nut 31 provided also with a handle.

Upon the shaft I I to the rear of the sleeve I is a collar 38 providedwith a jam screw 39. A coiled spring 40 is held in compression betweenthe collar and the rear end of the sleeve, thus exerting a forwardpressure against the sleeve. Upon the shaft l2 to the rear of the collar38 is a cam 4| rotatable therewith.

Vertically above the cam and secured to the rear wall of the bodyportion B is a cantilevered stub shaft 42. A rocker arm 43 is freelymounted upon this stub shaft and retained thereon by means of a nut 44.The lower end of this rocker arm is bifurcated as at 45, this portionbeing in engagement with the cam 4| as clearly shown in Figure 4. Abearing at the upper end of the rock er arm is journalled between asplit bearing 45, this bearing being rivetted to the under side of anangularly disposed reciprocating sieve 41. It will now be seen. thatthis sieve is free to move from side to side upon brackets. 48; attachedto the side walls of the body portion B.

In operation, the substance is poured into the hopper 2, from thencegravitating downwardly through an aperture onto the sieve 41. It isscreened through this sieve and falls into the body portion B. It ismoved forwardly under the action of the feed screw through the opening 3and into the compartment 49 of the grinding chamber 5. Here it fallsagainst the grinding surfaces l8 and 20, afterwards being dischargedupon the lower periphery of the grinding chamher and gravitatingdownwardly through the discharge passageway 50.

In the event of a stone or other obstruction finding its way into thebody portion and jamming the rotary action of the screw, this memberwill simply stop rotating while the disc I9 will continue to revolvewithout any harm being done due to the fact that the latter is only inlight bearing engagement with the sleeve of the former through the rib25 and its corresponding recess 24.

When it is desired to coarse grind a substance, the tightening nut 31 isslacked off and the spindle 30 rotated in a counterclockwise direction.In this way, a more considerable space is left between the grindingfaces l8 and 20. If it is desired to grind finely, the spindle 30 isrotated in the reverse direction.

In order to prevent any possibility of ground grain clogging in thegrinding chamber, I have provided the disc 19 at its periphery withhorizontally disposed fingers or pins 5| which rotate within the chamberand keep the area between the outer peripheries of the grinding surfacesand the flange of the chamber clear.

In the event of a very large obstruction finding its way into thegrinding chamber, the wall. 6 thereof is free to expand against thesprings I.

I have not thought it necessary in the drawings to show the entirehopper 2 since this may be of any desired configuration. I desire it tobe known, however, that I am able to place my sieve 41 in the hopperinstead of Within the portion B if desired, in which case I would ofcourse provide a longer rocker arm 43.

It should also be mentioned that instead of the ordinary cylindricalbearing surface, the surface of the hub 2| is convex towards the centreas at Zla so that the disc I9 is capable of a slight rocking action onthe shaft.

Since various modifications can be made in the above invention, and manyapparently widely different embodiments of same, made within the scopeof the claims without departing from the spirit and scope thereof, it isintended that all matter contained in the accompanying specificationshall be interpreted as illustrative only and not in a limiting senseand I desire only such limitations placed thereon as are specificallyexpressed in the accompanying claim.

What I claim as my invention is:-

A feed crushing machine comprising, in combination, a supportingtrestle, a body portion mounted thereupon, a hopper mounted above saidbody portion, a crushing chamber attached. to the forward side of saidbody portion and said supporting trestle, bearings at the apex of saidtrestle, a main shaft mounted upon said bearings and extending throughsaid body portion and through said crushing chamber, a shaft housingmounted upon the forward side of said crushing chamber, a thrust bearingassembly within said shaft housing, means upon said shaft housing foradjusting the end thrust of said shaft, a pulley mounted upon said shaftbetween said bearings upon said supporting trestle, a sleeve mountedupon said main shaft, a feed screw extending around said sleeve withinsaid body portion, said sleeve being provided at its forward end with adiametrically disposed rib, a spring mounted upon said shaft to the rearof said feed screw, a stationary annular grinding surface mounted uponthe rear wall of said crushing chamber, a r0- tatable grinding disc, ahub at the centre of said grinding disc, said hub being mounted uponsaid main shaft and being provided upon its rearward face with adiametrically disposed slot, said rotatable grinding disc having thefrontand rear faces tapering inwardly towards said hub, horizontallydisposed fingers attached upon the peripheral edge of said rotatablegrinding disc, an obliquely mounted Oscillating sieve within said bodyportion, a rocker arm attached to said sieve and extending downwardlywithin said body portion, a stub shaft extending into said body portion,said rocker arm being mounted upon said stub shaft, a bifurcated portionat the lower end of said rocker arm, a cam mounted upon said main shaftengageable with said bifurcated'portion, a cover plate for said grindingchamber, bolts extending through said casing and into the forward sideof said body portion and into the forward end of said supportingtrestle, coiled springs extending around the forward ends of said boltsupon the outer side of said casing, means for maintaining said springsin bearing contact with the forward side of said casing.

ADOLPH KRUSHEL.

